Hungaby



(No Model.) 5 sheets-sheet 1 J. NITSGHB & T. GRELLNETH. vPURE-ACE FOR STEAMA BOILERS.

WITNEEEEE: LNVENTREi qui N. PETERS. Plwwli lllllll ner. waxlinglm. D. C.

(N0 Model.) l 5 Sheets-Sheet 2.

J N-ITSGHE' 8v T. GREL'LNETH.

FURNAGE FOR STEAM BOILERS.. v101245,207. Patented Aug. 2,1881.

WITNESEEE INVENTURS:

(No Model.) 5 Shets--Sheet 3.

' J. NITSGHE & T. GREL TH. PURNAGE PORSTEAMBOL R 10,245,201 .Patented Aug. 2, 1&881.

(No Model.) f l s-he'efs-sheet 5. J. NITSCH-B 8v T. G LNBTH.

. FURNAGE PoR STEA Y LEES. l r1\0.24.5,207. L Patented Aug.2,1881.

FIG; |4..

, UNITED STATES PATENT OFFICE.

. .IosEF Nrrscnn AND THEoDoR GRELLNETH, oF VIENNA, AUsTao- HUNGARY.

FURNACEFOR STEAM-Bomans.

SPECIFICATION forming part of Letters Patent No. 245,207, dated August 2, 1881.

Application filed March 1, 1881. (No model.)

To aLl 'whom it may concerm' Y Be it known thatwe, JOSEF NI'rsoHF. and

THEoDoR GEELLNETH, both of Vienna, in the'V Empire of Austro-Hungary, have invented new and useful Improvements on Fnrnacesfor SteamLBoilers and Vother purposes; and we do hereby declare that the following is a full,

. formed into carbonio oxide andvotherwise escaping into the chimney, are thus again brought into contact with 'the oxygen of the heated air, and thus completely' burned. In the accompanying drawings we have shown two modifications or modes of carrying out this invention. `Figure 1 is a longitudinal section, andA Fig. 2 a part end view-and part cross-section of a fire-place with horizontal tubular grate; Fig. 3 is an enlarged part plan of the grate, and Fig. 4 a cross-section through same. Figs. 5 and 7 are modifications of the passage Q. Figs. 6,8, and 13 represent different modifications of the tubulargrate. Fig. 9 is a longitudinal section, and Fig. 10 a part end view and part cross-section,`of a lire-place with our so-calledvertical tubular grate.77` Fig. 11 is an enlarged part plan, partly in section, of such a grate; andFig. 12 is a part sectional eleva- ,tion of same. Fig. 14 is a cross-section, and

Fig. 15 is a plan, of a modification of the firebars.

The same letters refer to corresponding parts in all the figures.

In Figs. 1 to 4 the grate proper consists of separatesections, one of which is shown enlarged in Figs. 3 and 4. Each section consists of two or more (in this case three) high parallel or not parallel hollow bars, a,by preference of the section shown in Fig. 4, but it may be of any other suitable section, as shown in the modiiications Figs. 6, 8, 13, 14, or 15. These bars are at their ends united by a plate, a', or cast in one therewith. The plates a have openings corresponding with the ues C, through the hollow bars e, and have notches d in their upper edges for the lsolid tire-bars c to rest in,

and so as to leave spaces on each side between c and a for the free access of air from below to the fuel on the bars. A required number--here three--of such gratefsectionsrestson thedeadplate L, (or separate bearing-ban) and on the bearing-bars M, `N, and P, close together ylengthwise, and so that their flues b correspoud.

The form`and arrangement of the' hollow `and solid grate or furnace bars may, of course, Vbe varied without changing the principle 'on which this invention is founded. Thus, tubes of circular orany other, by preference, bye]d liptical section, Figs. 4, 6, 8, 13, and 15, may be so placed side by side or above each other, that the air froml the ash-pit passes partly -through such tubes to the chamber or passage Q, andpartly between such tubes up into the fuel. The hollow and the solid furnace-bars j may be made or castin one piece.

The fuel rests partly on lthe solid bars c and partlyV on the hollow bars a, and the air entering by the ash-pit door, passes partly from below up between the hollow bars a, and then between these and the solid bars c direct into the fire, and partly by the front apertures in the plates a into and through the hollow bars a, and thence into the cross-chamber Q, extending the whole width of thefurnace. The air, whichthus becomes very hot, then iiows out at a moderate height above the grate and right into and against the flame, which it supplies with fresh oxygen, thus causing the nnconsumed particles of coal, or the coal which has only been burned into carbonic-oxide to be totallyburned-that is, into carbonio acid. The

combustion is a particularly lively one. Moreover there is almost entire absence of smoke,

and the economy iu fuel is considerable.

The side of the chamber Q exposed tothe fire is covered with fire-brick or other fireproof material, or made'entirely of it, so as to resist the action of the very intense heat in this place. The chamber Q itself may be of castiron. The outlet may be tapered or contracted in order to produce greater air pressure or force.

Instead of using one chamber, Q, the air from the hollow lines Z) may be led into several smaller adjoining chambers, or adjoining and snperposed, or pipes, Figs. 5 and 7, oi' any serr tion, and terminating similarly over the grate; or the air may pass out from Q through two or more openings above each other, one or more of same being provided with dempers in, Fig. 5. If it be desired to let in cold air also, the sliding damper T S may be opened, admitting air from the ash-pit U.

G is the tine for the products ofconibustion to pass off by, and V the bottom of the steamboiler.

These grates are easily applicable to all existin g fireplaces, and are suitable for all kinds of fire-places for domestic room and kitchen fireplaces, for stationary boilers, and for marine and locomotive boilers.

In consequence of the lively combustion produced a lower chimney may be used, and the smoke, which is so obnoxious with factories and heating apparatus, done away with.

Instead of using hollow fire-bars of the l'orm shown in Fig. 14, tubes of the form shown in Figs. 6, 8, 13, and 15 may be employed.

In another modification Figs. 9, 10, 11, and 12, A is the grate proper, consisting of two plates, g and h, the former having smaller and the latter having larger holes for receiving tapeetnyeres a, of circular, elliptical, or other section, so as lo form one piece or structure. The plates may be of sheet-iron and the tuyeres of cast-brass, and with shoulders at top and bottom, and riveted over, or the tuyeres may be of sheet-iron and united with the plates by drifting or expanding, as with the tubes and lire-box of a locomotive. In many cases, especiallyT for very large fireplaces, the whole grate may be cast in one.

'lhe upper holes in the tuyeres should beso small that the fuel does not fall through; the .tuyeres should, in fact, be as numerous as possible without unduly weakening the grate.

The grate rests here on the dead-plate L and bearingbar P, or is supported in any other well-known manner. The air from the ash-pit door passes partly through e direct in among the fuel and flame and partly between the two plates g and 7L, around the outside ofthe tuycres e, in the direction of the arrow B, into the chamber Q, and thence into the flame, as described with reference to the first modification. In this case, also, the air to be let in above the grate may have its exit from several adjoining or superposed chambers or pipes instead of one chamber, Q.

Our grates are easily cleaned by means of steam admitted from the boiler.

Instead of the ordinary atmospheric air, we may pass oxygen, hydrogen, steam, superheated or not, or combustible gases or vapors through the hollow bars 0r pipes, collect them into the chamber Q, and let them thence into the ilame.

le claim- 1. A boilerfurnace grate-bar consisting of the hollow bars a, provided with perforated end plates, a', having notches d, and the solid lire-bars c, resting in the notches of the said end plates, substantially as herein shown and described.

2. In a boiler-furnace grate-bar, the combination, with the hollow7 bars a and the perforated end plates, a', provided with notches d, of the solid firebars c, having enlarged ends and middle portions, substantially as herein shown and described.

`3. The combination, with the dead-plate L, the bearing-plates M N I?, and the chamber Q, extending across the whole width ot' the furnace at the rear of the colnbustion-chamber, and provided with a valve of the grate-bar composed of alternate hollow and solid bars a c and the end-plates a', the said solid bars being supported in notches of the endplates, substantially' as and for the purpose set forth.

JOSEF NITSGHE. THEODOR GRELLNETH.

Witnesses HENRY PALM, THEODOR EATER. 

